Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions
While bidecadal climate variability has been evidenced in several North Atlantic paleoclimate records, its drivers remain poorly understood. Here we show that the subset of CMIP5 historical climate simulations that produce such bidecadal variability exhibits a robust synchronization, with a maximum...
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ftird:oai:ird.fr:fdi:010064150 2024-09-15T18:09:43+00:00 Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions Swingedouw, D. Ortega, P. /Mignot, Juliette Guilyardi, E. Masson-Delmotte, V. Butler, P. G. /Khodri, Myriam Seferian, R. ATLANTIQUE NORD 2015 https://www.documentation.ird.fr/hor/fdi:010064150 EN eng https://www.documentation.ird.fr/hor/fdi:010064150 oai:ird.fr:fdi:010064150 Swingedouw D., Ortega P., Mignot Juliette, Guilyardi E., Masson-Delmotte V., Butler P. G., Khodri Myriam, Seferian R. Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions. 2015, 6, p. art. 6545 [12 p.] text 2015 ftird 2024-08-15T05:57:41Z While bidecadal climate variability has been evidenced in several North Atlantic paleoclimate records, its drivers remain poorly understood. Here we show that the subset of CMIP5 historical climate simulations that produce such bidecadal variability exhibits a robust synchronization, with a maximum in Atlantic Meridional Overturning Circulation (AMOC) 15 years after the 1963 Agung eruption. The mechanisms at play involve salinity advection from the Arctic and explain the timing of Great Salinity Anomalies observed in the 1970s and the 1990s. Simulations, as well as Greenland and Iceland paleoclimate records, indicate that coherent bidecadal cycles were excited following five Agung-like volcanic eruptions of the last millennium. Climate simulations and a conceptual model reveal that destructive interference caused by the Pinatubo 1991 eruption may have damped the observed decreasing trend of the AMOC in the 2000s. Our results imply a long-lasting climatic impact and predictability following the next Agung-like eruption. Text Greenland Iceland North Atlantic IRD (Institute de recherche pour le développement): Horizon |
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Open Polar |
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IRD (Institute de recherche pour le développement): Horizon |
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ftird |
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English |
description |
While bidecadal climate variability has been evidenced in several North Atlantic paleoclimate records, its drivers remain poorly understood. Here we show that the subset of CMIP5 historical climate simulations that produce such bidecadal variability exhibits a robust synchronization, with a maximum in Atlantic Meridional Overturning Circulation (AMOC) 15 years after the 1963 Agung eruption. The mechanisms at play involve salinity advection from the Arctic and explain the timing of Great Salinity Anomalies observed in the 1970s and the 1990s. Simulations, as well as Greenland and Iceland paleoclimate records, indicate that coherent bidecadal cycles were excited following five Agung-like volcanic eruptions of the last millennium. Climate simulations and a conceptual model reveal that destructive interference caused by the Pinatubo 1991 eruption may have damped the observed decreasing trend of the AMOC in the 2000s. Our results imply a long-lasting climatic impact and predictability following the next Agung-like eruption. |
format |
Text |
author |
Swingedouw, D. Ortega, P. /Mignot, Juliette Guilyardi, E. Masson-Delmotte, V. Butler, P. G. /Khodri, Myriam Seferian, R. |
spellingShingle |
Swingedouw, D. Ortega, P. /Mignot, Juliette Guilyardi, E. Masson-Delmotte, V. Butler, P. G. /Khodri, Myriam Seferian, R. Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions |
author_facet |
Swingedouw, D. Ortega, P. /Mignot, Juliette Guilyardi, E. Masson-Delmotte, V. Butler, P. G. /Khodri, Myriam Seferian, R. |
author_sort |
Swingedouw, D. |
title |
Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions |
title_short |
Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions |
title_full |
Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions |
title_fullStr |
Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions |
title_full_unstemmed |
Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions |
title_sort |
bidecadal north atlantic ocean circulation variability controlled by timing of volcanic eruptions |
publishDate |
2015 |
url |
https://www.documentation.ird.fr/hor/fdi:010064150 |
op_coverage |
ATLANTIQUE NORD |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010064150 oai:ird.fr:fdi:010064150 Swingedouw D., Ortega P., Mignot Juliette, Guilyardi E., Masson-Delmotte V., Butler P. G., Khodri Myriam, Seferian R. Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions. 2015, 6, p. art. 6545 [12 p.] |
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1810447308792266752 |